An accurate speech signal modeling for communication applications on IP networks

摘要

This article deals with speech coding, which is particularly crucial for modern telecommunication systems. Since the end of the 30's, a lot of work has been done in the speech coding domain. But in spite of the numerous norms and products that have been developed, challenges subsist and are more than ever a topical question. In this article, we have focused on the modeling of the speech signal. Hence we have studied a spectral modeling based on the MBE (MultiBand Excitation) model as the INMARSAT coder normalization in 1991 [1] demonstrates the maturity of this approach. This coder gives a good quality/bit rate compromise, however it presents some limitations in terms of performance. In a first step, our study has consisted in proposing some improvements. This has led us to develop a coder modeling partly based on an improved MBE modeling, and on new modeling technologies.